Following a particularly heinous gastral discharge, the essence of fart that clings to a person and follows them as they move, usually good for a range of anywhere between 5-50 feet.

Tom excused himself to go rip a huge cloud of methane from his ass in another room, but he didn't wait long enough for the fart to dissipate. He came back to his desk dragging a nasty fart trail behind him that made the rest of us nauseous.

The process of tightning your but cheeks and letting loose continous little farts while walking usally more than 3 to 5 steps for fear of ripping one ginormous fart

Oscar: holy crap dude...
Jason: what?
Oscar: I totaly farted a huge trail back there. It mustve been that entire hall way!!
Jason: is that what that tapping sound was?!!? Man that mustve been a huge fart trail, that tapping was going on for a good minute and a half!!!!!